ATI Radeon HD 4000 Series discussion

[largon]

seems they got problems with the gddr5 memory... only 1800 mhz clock (slowest bin)?

Thats without the DDR taking effect and making it 3.6GHz effective.

Nah.
That "1800m" is DDR-1800 (900MHz). But since GDDR5 is quad data rate 900MHz GDDR5 acts effectively as DDR-3600.